1. Will Ozil start?
With Tomas Rosicky set to miss Arsenal's Saturday clash at Sunderland with a thigh injury he picked up on international duty with the Czech Republic, there's a strong chance Mesut Ozil will start in his first appearance for the Gunners. Wenger could alternatively opt to bring in Mathieu Flamini to play deeper in midfield alongside Aaron Ramsey and push Jack Wilshere into the #10 role. However, against a Sunderland side likely to set up defensively, the prospect of a center midfield trio with as much creativity and attacking ability as Ramsey, Wilshere and Ozil would likely appeal to Wenger. An attacking six of Ramsey, Wilshere, Ozil, Cazorla, Walcott and Giroud offers the prospect of some truly exciting attacking football. Sunderland's 5 goals against are tied for the worst in the Premier League and the atmosphere is a little stale around the Stadium of Light with Paolo Di Canio continuing to publicly call out his own players- they'll need to be organized and get a big boost from the home crowd to have a chance at getting something out of this one.

(UPDATE: Ozil missed Arsenal's training session today with an illness but will travel with the team to Sunderland. Per Mertesacker also missed with illness and will not travel).

2. West Ham vs. Southampton: who will win out in clash of styles?
The intrigue of this game is that it pairs two sides with two very different playing styles. West Ham manager Sam Allardyce places far more emphasis on territory than possession. His side is 16th in the league in average possession with 44.4% and have been outpossessed in all three of their opening fixtures. Those stats are particularly startling given two of those games were at home to Cardiff and Stoke, a newly promoted side and a side infamous for its inability to retain the ball (they were also outpossessed at Newcastle in match week 2). West Ham are organized and difficult to break down defensively. They shuttle the ball into wide areas, cross early and often and look for knock downs. They've attacked through the middle of the pitch less than any team this season. The loss to injury of towering forward Andy Carroll and talented crossers Joe Cole and Stewart Downing will certainly hurt West Ham's ability to play their preferred style effectively. Mauricio Pochettino's Southampton side on the other hand currently sits third in the league in terms of average possession. They prefer a more patient, passing attack. The striking partnership of Dani Osvaldo and Rickie Lambert failed to produce a goal in Southampton's loss to Norwich two weekends ago so it'll be interesting to see if Pochettino goes with both those two up front again or decides to go with just one striker. In that loss at Norwich they struggled to defend the flanks which could provide West Ham opportunities to get crosses into the box to Modibo Maiga and Kevin Nolan. West Ham haven't won on their travels since March 2- with a depleted squad that's unlikely to change Sunday. Still, this should be an entertaining game for the clash of footballing philosophies on display.

3. Will Martinez be brave against Chelsea?
Roberto Martinez is a far more proactive manager than his predecessor at Everton David Moyes. Whereas Moyes tends to react to the strengths of each opposition and organize his squad accordingly, Martinez focuses more on his own team's approach. Martinez's Wigan side played Chelsea in the opening fixture of last season and he showed he was unafraid to play expansive, attacking football. Wigan finished the match with more possession but were picked apart twice on the counter in the opening 10 minutes and Chelsea held on for a fairly comfortable 2-0 win. Herein lies the crucial question with Martinez. His sides generally play a brand of football that is attractive on the eye but is he willing to adjust his style to achieve better results? So far his Everton side lead the league in possession yet have managed just three draws. While much of that can be blamed on players getting used to the new system and the lack of an in form striker, questions remain regarding whether Martinez can combine style with substance. If his side continue the trend of bossing possession Saturday against Chelsea, they'll have to be extremely cautious about being caught on the counter. The Blues have a gaggle of talented midfielders capable of reeking havoc on the break and in Jose Mourinho a manager more comfortable playing a counter-attacking style. New signings James McCarthy and Gareth Barry will provide options for Martinez in the middle of midfield after the departure of Marouane Fellaini but on loan striker Romelu Lukaku will be unavailable to play against his parent club. It'll also be interesting to see whether Willian and Samuel Eto'o get their first minutes for Chelsea.

4. Will Kagawa play?
Since the appointment of David Moyes at Manchester United, Shinji Kagawa has played just 7 minutes of competitive football after coming on as a late substitute in the community shield. Moyes has instead opted to use Wayne Rooney and Danny Welbeck in Kagawa's preferred role behind main striker Robin Van Persie. A 0-0 draw to Chelsea followed by a 1-0 defeat to Liverpool saw Manchester United fail to score in successive games for the first time since August 2007. The lack of offensive output has many wondering why Moyes has refused to field a player with the creative ability of Kagawa. Concerns over Kagawa's ability to defend have been suggested and against stronger sides like Chelsea and Liverpool perhaps Moyes wanted first and foremost to ensure his side had a strong defensive shape. This wouldn't be a huge surprise given Moyes has always been a fairly reactive, conservative manager. However, with newly promoted Crystal Palace coming to Old Trafford and Wayne Rooney sidelined with an injury, not giving Kagawa a shot would make little sense this weekend.

5. Can Liverpool continue unbeaten run?
Brendan Rodgers' side has shown tremendous character opening the season with three difficult wins- an away victory over Aston Villa sandwiched between home wins over Stoke and Manchester United. It's the first time Liverpool have opened a league campaign with three wins since the 1994-95 season. All three wins of those wins have ended in a 1-0 scoreline and the Reds have had to dig deep in each. These were the type of fixtures they were dropping points in last season, points they'll need to pick up to have chance at a top four finish this campaign. They're the only side yet to have conceded. Daniel Sturridge is starting to show his promise having netted all three game winners. Rodgers managed to strengthen his side on transfer deadline day adding French center back Mamadou Sakho and winger Victor Moses on loan from Chelsea. It took Liverpool until October 20 to reach 9 points last season so there's plenty of reason for optimism at Anfield this time around, particularly given the strong form they showed in the second half of last season.

In traveling to Swansea Monday night they'll face another talented opponent. The Swans owe much of their current 16th place standing to a difficult run of opening fixtures, having opened the season with a home loss to champions Manchester United before being beaten by Tottenham at White Hart Lane. They managed their first win of the campaign 2-0 over West Brom at the Hawthornes two weekends ago and will look to use that win and a boisterous home crowd to motivate them Monday night. The Welsh side did however manage just 6 home league wins last season- the 7th fewest in the league.

Chelsea 5-1 Southampton: Ba gives Blues more direct threat in final third
Chelsea bounced back from their shock league defeat Wednesday to QPR to run away 5-1 winners at St. Mary's in Demba Ba's debut outing. It took the Senegalese striker just 35 minutes to get on the score sheet at his new club and he added a second at the hour mark.

Ba's movement in the penalty area was excellent and his performance illustrated how he'll enable Chelsea to be more direct and use more width in the final third than they do with Fernando Torres in the lineup.

Torres is not the type of striker that remains in the box and gets himself into dangerous positions to poach goals: rather he likes to move into positions where he can become involved in the buildup play. He tends to either drop into midfield or float into the channels to receive the ball. Because Chelsea always play with only one center forward, Torres's movement back into midfield and into wide areas means the Blues are often left with no one to pounce on balls played into the penalty area.

When he drops between the lines to get on the ball, Chelsea's play tends to become quite narrow. Their wide midfielders pinch in field to offer passing options and look for quick combinations down the middle. When he floats into the channels he's often able to create overloads for the opposition outside backs but it also leaves Chelsea with too few players in the box to attack balls played in from wide areas.

Ba offered a different option Saturday. He tended to stay in central areas high up the pitch alongside Southampton's center backs, rarely dropping back into the space occupied by Mata. This allowed Mata more space in between the seams to get on the ball and use his creativity to pick apart the Southampton defense. Moses and Hazard were able to stay in wider areas and Mata moved from flank to flank from his central attacking midfield position to create overloads in the channels. Because Ba remained in and around the penalty area, Chelsea always had at least one person to aim balls in the box to when they got the ball in wider areas in the attacking third.

Ba offers Chelsea a physical presence in the box and his aerial ability will allow them to play with more width and send more crosses into the box. His instincts and movement in the penalty area are excellent, highlighted most clearly by the near post run he made on his second goal. Just moments later he demonstrated his clever movement in the box once again as he peeled off to the back post to receive a cross from Hazard (or was it Mata/Cole/Moses???). His headed effort was saved but the move showcased a direct threat Chelsea hadn't shown all season.

West Ham 2-2 Manchester United: United struggle in final third against powerful Hammers midfield
Alex Ferguson fielded a lopsided 4-3-1-2 and Manchester United struggled to dictate play in the final third. Tom Cleverley and Paul Scholes played center midfield and Shinji Kagawa was employed higher up the field as the link man behind the front two pairing of Danny Welbeck and Javier Hernandez. Rafael was used at right midfield meaning Manchester United had more numbers on the right side of the pitch than the left.

Early on Ferguson's side were able to take advantage of overloads down the right, causing matchup problems for West Ham's left back Daniel Potts. Smalling pushed on down the touchline from right back while Rafael tucked inside. Hernandez made diagonal runs into the right channel leaving West Ham to defend 2 v. 3 down that flank. Unsurprisingly the Red Devils' opener came from a well worked one-two down the right between Hernandez and Rafael.

The opener seemed to wake Allardyce's side up and minutes later they drew level in very West Ham-like fashion: a free kick ultimately fell to Joe Cole on the left flank who whipped in a fine cross for James Collins to head home.

With the scores level, West Ham used their work rate and physical strength in midfield to frustrate Ferguson's side. The game closely resembled West Ham's 3-1 league win over Chelsea early in December when the Hammers physically battered Chelsea's diminutive attacking midfielders. The likes of Eden Hazard and Juan Mata were simply overpowered in the Blue's attacking third leaving Chelsea unable to link defense to offense and create meaningful scoring chances.

Kagawa had a similar experience Saturday. Playing as the link man behind Welbeck and Hernandez, he was unable to find the space to get any kind of meaningful touches on the ball. When he was able to get in possession he was quickly closed down and bullied off the ball by the likes of Alou Diarra and Jack Collison.

The experiences of Chelsea and Manchester United suggest using a player with physical strength in possession to play the attacking midfield role is perhaps a better bet against West Ham than a smaller creative player. Had Wayne Rooney been fit he would have been able to use his strength and power to get the ball in tight pockets of space, keep possession and win free kicks.

Ultimately, as they so often do, Fergie's substitutions made the difference as Ryan Giggs provided an incredible ball over the top to Van Persie whose first touch and finish highlighted why he's the best striker in the Premier League.